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[1]刘方杨宏伟邓付洁.掺氢天然气输送用X65管线钢的氢脆行为[J].油气储运,2024,43(01):1-9.
　LIU Fang,YANG Hongwei,DENG Fujie.Hydrogen embrittlement behavior of X65 pipeline steel for hydrogen doped natural gas transportation[J].Oil & Gas Storage and Transportation,2024,43(01):1-9.

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掺氢天然气输送用X65管线钢的氢脆行为

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年01期页码: 1-9 栏目: 出版日期: 2024-01-25

Title:: Hydrogen embrittlement behavior of X65 pipeline steel for hydrogen doped natural gas transportation

作者:: 刘方杨宏伟邓付洁

Author(s):: LIU Fang; YANG Hongwei; DENG Fujie

关键词:: 管线钢; 氢脆; 气相原位充氢; 慢应变速率拉伸; 断裂韧性

Keywords:: pipeline steel; hydrogen embrittlement; gas phase in-situ hydrogen charging; slow strain rate stretching; fracture toughness

分类号:: TE832

文献标志码:: A

摘要:: [目的]将氢气以一定比例掺入现有天然气管网进行大规模长距离输送是氢能储运最为高效和经济的方式之一，但是在氢气环境中管线钢可能发生氢脆现象，导致其力学性能发生退化，为管道的安全运行带来隐患。天然气管道掺氢输送工程应用实施的关键需要对掺氢输送管线钢进行力学性能评价，明确掺氢后掺氢比对管线钢氢脆敏感性的影响规律。[方法]基于ASTM G142-2016标准，采用自行设计带有压力容器的慢应变速率拉伸试验系统进行高压气相原位充氢慢应变速率拉伸试验以及借助Instron 8801伺服液压疲劳测试系统开展高压气相原位充氢准静态断裂韧性试验，开展不同氢气压力环境条件下X65管线钢的氢脆行为研究，并结合断口形貌分析研究不同掺氢比对管线钢的力学性能影响。[结果]X65管线钢在总压为9 MPa，掺氢比例为3%、5%、10%的条件下，与无氢环境相比断后总延伸率下降程度在11.5%以内，而断裂韧性在3%氢气和10%氢气环境分别下降23.5%和43.1%，氢脆程度随掺氢比例增加而加剧，断口形貌表明在掺氢比例小于10%的条件下，试样断口主要形貌均以韧性断裂为主，没有典型脆性断口形貌。[结论]对于X65管线钢尤其是在役运行多年的管道，如需开展掺氢输送，建议开展相关管线钢氢脆敏感力学性能评价分析工作，确保管道的安全运行。

Abstract:: Mixing hydrogen into existing natural gas pipelines in a certain proportion for large-scale long-distance transportation is one of the most efficient and economical ways of hydrogen energy storage and transportation. However, in hydrogen environments, pipeline steel may experience hydrogen embrittlement, leading to degradation of its mechanical properties and posing hidden dangers to the safe operation of pipelines.The key to the application and implementation of natural gas pipeline hydrogen blending transportation engineering is to evaluate the mechanical properties of hydrogen blending pipeline steel and clarify the impact of hydrogen blending ratio on the hydrogen embrittlement sensitivity of pipeline steel after hydrogen blending. Based on the ASTM G142-2016 standard, a self-designed slow strain rate tensile testing system with pressure vessels was used to conduct high-pressure gas phase in-situ hydrogen charging slow strain rate tensile testing, and high-pressure gas phase in-situ hydrogen charging quasi-static fracture toughness testing was conducted using the Instron 8801 servo hydraulic fatigue testing system. The hydrogen embrittlement behavior of X65 pipeline steel under different hydrogen pressure environmental conditions was studied, and combined with fracture morphology analysis, the influence of different hydrogen doping ratios on the mechanical properties of pipeline steel was studied.The results show that when the total pressure of X65 pipeline steel is 9 MPa and the proportion of hydrogen doping is 3%, 5% and 10%, the total elongation after fracture decreases within 11.5% compared with that in the hydrogen free environment, while the Fracture toughness decreases by 23.5% and 43.1% respectively in the 3% and 10% hydrogen environments. The degree of hydrogen embrittlement increases with the increase of the proportion of hydrogen doping. The fracture morphology shows that under the condition of hydrogen doping ratio less than 10%, the main fracture morphology of the sample is ductile fracture, without typical brittle fracture morphology.Therefore, for X65 pipeline steel, especially pipelines that have been in service for many years, it is recommended to carry out hydrogen blending transportation and carry out evaluation and analysis of the hydrogen embrittlement sensitive mechanical properties of relevant pipeline steel to ensure the safe operation of the pipeline.

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更新日期/Last Update: 2023-11-24